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A012094
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E.g.f.: tanh(arcsin(arctan(x))), odd powers only.
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1
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1, -3, 49, -1859, 127297, -13662371, 2114110257, -445110767139, 122308548673025, -42491524107649475, 18204849127687565745, -9427087716053634833795, 5803356448065850202170945, -4188507975000626549209008995, 3502566426777342320289454951345
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OFFSET
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0,2
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LINKS
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EXAMPLE
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tanh(arcsin(arctan(x))) = x-3/3!*x^3+49/5!*x^5-1859/7!*x^7+127297/9!*x^9...
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MAPLE
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a:= n-> (t-> t!*coeff(series(tanh(arcsin(arctan(x))), x, t+1), x, t))(2*n+1):
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[ArcSin[ArcTan[x]]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, May 09 2012 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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STATUS
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approved
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